Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752566AbZIZO1o (ORCPT ); Sat, 26 Sep 2009 10:27:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752230AbZIZO1n (ORCPT ); Sat, 26 Sep 2009 10:27:43 -0400 Received: from mail-fx0-f218.google.com ([209.85.220.218]:58430 "EHLO mail-fx0-f218.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751401AbZIZO1m convert rfc822-to-8bit (ORCPT ); Sat, 26 Sep 2009 10:27:42 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; b=HUP1ziGtwFATSNVjf49duBMUVChZ5Ja3w+JVFFc/GrYmXgFI3c1nJTsR8GwHidmZJQ KanEcyhMJxljMRQD8PaA0sOXKHopKEGKTpxGO6abxALbT86Ti/k9t4hRWhzxhRJX7dc5 lFZj2EdpWvDiPrelCdYElSQd0rtbu0LuFVl4U= MIME-Version: 1.0 In-Reply-To: <20090919231810.GE7121@mit.edu> References: <20090919231810.GE7121@mit.edu> Date: Sat, 26 Sep 2009 16:27:46 +0200 Message-ID: Subject: Re: EXT4 RAID read performance From: wbrana@gmail.com To: Theodore Tso , linux-kernel@vger.kernel.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1264 Lines: 39 On Sun, Sep 20, 2009 at 1:18 AM, Theodore Tso wrote: > You didn't say which version of the kernel you are using, which could > be important when asking these sorts of questions about potential > performance problems. > 2.6.31 > > Now, there are some workloads which compilebench might accurately > model --- for example, tar'ing up a directory.  However, despite the > name of the benchmark, it doesn't accurately model a kernel compile. > You are right. I created simple benchmark which does real compilation of kernel with following results: reiser3 16925 msec: tar xf /usr/src/linux.tar 119173 msec: make -j4 all ext4 14296 msec: tar xf /usr/src/linux.tar 116692 msec: make -j4 all btrfs 13493 msec: tar xf /usr/src/linux.tar 116015 msec: make -j4 all MD RAID10-f2 with 256 kB chunk size was used in all cases. Source code: http://www.sendspace.com/file/fmikv7 It depends on Qt Core library. There are hard-coded paths. It can delete important data if it is started without customization !!! -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/